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Leanstral 1.5: Proof Abundance for All

Source: mistral.ai
Date: Published Jul 2, 2026

Why it matters

An openly licensed Lean 4 proof model with a free API that surfaced five real bugs across 57 open-source repos, making formal verification of code properties cheap enough to put in an ordinary engineering loop.

Read the source ↗mistral.ai

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articleLeanstral: Open-Source foundation for trustworthy vibe-codingmistral.ai
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articleDevstralmistral.ai

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